Tool-holding device



J. T. HESCOCK TOOL-HOLDING DEVICE Aug. 22, 193.

Filed Feb. 25, 1938 3 Sheets-Sheet 2L i 2. KW $0M Z Aug. 22, 1939. .3. T HISCOCK IDOL-HOLDING DEVIC 3 Sheets-Sheet 2 led Feb. 25, 1938 llll fizz e1? for. 3 I01? 7 7/2360'6k,

Aug. 22, 1939. J. T. HISCOCK 2,170,590

TOOL-HOLDING DEVICE Filed Feb. 25, 1938 3 Sheets-Sheet s Patented Aug. 22, 1939 UNITED STATES .PATENT OFFiCE TOOL-HOLDING DEVICE.

John T. Hiscock, Chicago, Ill.

Application February 25, 1938, Serial No. 192,636

21 Claims.

cured in position on the machine, as for example in the slotted tool post as commonly provided, and adapted to support a tool therein in different angular positions of adjustment, my primary objects in this connection being as follows:

To provide a novel, simple and economical construction of tool holder of the general character above referred to and which shall be of rigid con? struction to resist the stresses to which it is subjected in use and which will rigidly support the tool in its different positions of angular adjustment; and to provide a construction of tool holder which shall be relatively compact and of small dimensions to adapt the tool to be inserted into relatively small openings in work to be bored; and other objects as will be manifest from the following description.

The invention also relates to a tool holding attachment or fixture for use more particularly, though not exclusively, as an adjunct to a tool holding element of a machine and especially to a tool holder embodying my invention; my objects in this connection being to provide such an attachment which may be applied to use without disturbing the position of the tool holder to which it is applied, or the tool therein when in certain positions, and which may be used alone to engage the work from an end thereof as for example to bore, or ream, an opening in the end of the work, or may be used in conjunction with a tool in the tool holder as for example to produce in succession and simultaneously a rough cut and a fine cut; and other objects as will be manifest from the following description.

The present application is a continuation in part of my application for U. S. Patent, Serial No. 123,915, filed February 3, 1927, for Tool holder.

Referring to the accompanying drawings:

Figure l is a fragmentary sectional view of a tool holder embodying my invention showing a tool in place therein.

Figure 2 is a view in side elevation of the holder shown in Fig. 1.

Figure 3 is a plan sectional view taken at the broken line 3-3 on Fig. 2 and viewed in the direction of the arrows.

Figure 4 :is a section taken at the line 46.4

on Fig. 2 and viewed in the direction of the arrows.

Figure 5 is a view like Fig. 2 of a modification of the structure therein shown.

Figure 6 is a section taken at the line 6-6 on Fig. 5 and viewed in the direction of the arrows.

Figure 7 is a section taken at the line I on Fig. 5 and viewed in the direction of the arrows.

Figure 8 is a plan View of my tool holding attachment or fixture with a tool supported thereon, the attachment being shown as supported on the tool holder of Figs. 1-4, this view also showing a tool post in which the tool holder is mounted.

Figure 9 is a view in side elevation of the tool holding element of Fig. 8 supported by the attachment shown in this figure.

Figure 10 is a section taken on the line IU-Hl on Fig. 8 and viewed in the direction of the arrow.

Figure 11 is a section taken at the line H-ll on Fig. 10 and viewed in the direction of the arrows. v

Figure 12 is a section taken at the line l2l2 on Fig. 8 and viewed in the direction of the arrows.

Figure l3is a fragmentary plan View of a lathe illustrating my improved tool holder and attachment applied thereto for producing in succession and simultaneously a rough cut and a fine cut; and

Figure 14, a similar view of the lathe with my improved tool holder and attachment applied thereto for reaming an opening in the end of a piece of work.

Referring to the construction shown in Figs. 1-4, the tool holder, in accordance with this particular embodiment of my invention, comprises a supporting member in the form of a bar [5 the main body portion of which is in the form of a flat bar 16 and the end thereof to receive the tool as hereinafter described of cylindrical form as represented at I1.

The tool holder is adapted to be positioned at its bar portion It in the opening in a tool post as commonly provided, as for example in lathes, the tool holder being secured to the post as for example by a set screw.

The outer cylindical end I! of the bar has a recess l8, shown as inclining slightly upwardly toward the terminal end of the bar with upper and lower walls 19 and 26 which are connected together at opposite sides of the recess by means of pillars or webs 2! and 22 shown as formed integrally with the bar I5 and set back, or spaced,

from the terminal end face 23 of the bar and from the bottom 24 of the recess l8 as shown, the.

inner surface of the web 25 being formed of angularly disposed surfaces 25 and 26 and the inner surface of the web 22 being formed of angularly disposed surfaces 21 and 28. The tool holder is shown as provided with a tool represented at 29 for cutting the work, the provision of the recess and webs as described being such that the tool may be swung on the bar I 5 into any desired position of angular adjustment thereon from a position in which the tool extends parallel with the bar it? to any selected position either to the right or to the left within the limits of the webs 2! and 22 the surfaces 25-28 of which'form stops limiting the angular adjustment of the tool.

It may be here stated that the surfaces 25-48 are preferably so shaped and disposed that when the tool 29 occupies the position shown in Figs. 1-4 the pressure of the tool against the work will cause opposite sides of the tool to bear against the stop surfaces 26 and 21 as shown in Fig. 3 thereby rigidly holding the tool in the desired position. When the tool 29 is swung to the other extreme angular position its opposite sides will engage the surfaces 25 and 28 which thus serve to rigidly hold the tool in position under the thrust exerted against it in operating on the work. In either position of the tool, in accordance with the preferred embodiment of the invention, both sides of the tool engage substantial areas of the stop surfaces as shown in Fig. 3 with the manifest advantage.

The tool holder is also provided with means for clamping the tool 29 in place, these means being shown as comprising a set screw 30 screwed into a threaded bore 3! extending through the side wall E9 of the recess l8 and through an upwardly extending boss 32 formed integrally on the wall I7, the inner end of the set screw being adapted to bear against the tool which in turn is clamped against the lower wall l8.

As will be noted, the set screw 30 is located midway between the stop forming surfaces on the webs 2| and 22 in a direction crosswise of the bar l5 and also midway of the front and rear edges of the stop forming portions of these webs in a direction lengthwise of the bar which is desirable inasmuch as the strain on the webs tending to spread the walls of the recess apart when the tool is clamped by the set screw, is substantially equally distributed on the webs.

As will be understood, the webs 2i and 22 at the sides of the recess in the bar prevent the walls of the recess from spreading under the stresses to which they are subjected in the tightening of the means for clamping the tool in adjusted position, this being a particularly desirable feature of my construction inasmuch as it permits of the walls of the recess being made relatively thin resulting'in the terminal end of the supporting bar being made relatively compact and of small cross sectional dimensions of particular advantage when relatively small openings are to be bored or reamed on the interior surfaces of articles. Furthermore, the means. referred tofor preventing spreading of the walls, in the particular construction shown, also serve as stop means for the tool in the adjusting of the latter, facilitating the quick adjustment of the tool to either of the two extreme angular positions in which the tool is to be used.

A holder in accordance with my invention permits of the use of the same tool for cutting straight into the work or at an angle from either the right or left hand side thereof, though, if desired, straight and right and left hand tools may be used selectively for the different cutting operations above referred to.

My invention also contemplates the use of a tool holding element in which the tool is received and which moves with the tool as a unit in the adjusting of the tool into its different positions of angular adjustment, a feature which may be incorporated in the tool holder with advantage, especially where very small tools are employed.

An example of such a modified structure is shown in Figs. 5, 6 and '7 wherein the tool holder is shown as formed of a bar 33 corresponding with the bar l5 and provided in its outer end with a recess 34 with flanking Webs or pillars 35 at opposite sides of the recess and shown as formed integrally with the bar 33. In this construction the tool holding element referred to is represented at 35 it being shown as in the form of a block located in'the recess 34 between the webs 35. The block 36 is formed between its ends with a substantially circular portion 31 at which it extends between the webs 35, and toward its opposite ends, at opposite sides of the portion 31, with stop surfaces 38, 39, 4e and H for cooperation with the webs to limit rotation of the block 35 on the bar 33.

The block 38 is provided along one face thereof, in the construction shown on its upper face, with a medial groove 42 for receiving a tool to be held by the device and represented at 43.

The portion 31 of the block 35 at its center has an opening M at which this block is journaled on a pin 45 secured in the lower Wall of the recess 34, this pin serving to permit the block to be swung into any desired position on the bar 33 while maintaining it from bodily displacement thereon.

From the above description of the device it will be understood that the holder block 36 may be swung on the bar 33 into any desired position of angular adjustment thereon from a position in which the block extends parallel with the bar 33 to any selected position either to the right or to the left within the limits of the stop means above referred to.

Means are provided for securing the tool 43 and block 36 in any desired position of adjustment, these means comprising a set screw 46 threaded in an opening ll in the upper wall of the recess 36 and bearing against the upper surface of the tool 43 and, when tightened, serving to clamp the tool rigidly to the block 36 and the latter against the lower wall of the recess 34.

Referring now to the tool holding attachment or fiXture illustrated in Figs. 8 to 14, inclusive, it comprises a head structure represented generally at 48 and having two parallel cylindrical openings 49 and 50 extending entirely therethrough. The walls of these openings are split as represented at 5| and 52, respectively, to form means at which the attachment may be clamped upon an element carried by the tool post of the lathe, as for example the bar I5, and mount a cutting tool on the head. The clamping means for the opening 49 comprises a clamp screw 53 which extends rotatably through the body of the metal at one side of the slit 5! and screws into the body of metal at the opposite side of this slit; the clamp for the opening 50 comprising a clamping screw 54 similarly positioned.

The attachment 48 is shown as adapted to be secured'to the element projecting from the tool post of a lathe and represented'in Fig. 8 at 55, in any desired position of angular adjustment about the axis of said element. As shown, the attachment 48 is journaled on the cylindrical portion I! of the tool holder l5. As the tool holder l5 includes the projecting boss 32, desirable especially to reduce Weight of the tool holder and still afford the desired depth of metal at the threaded bore 3|, the inner wall of the opening 49 contains a groove 56 extending lengthwise thereof from its right hand end (Figs. 8, and 11) to a point short of its opposite end, this groove opening into an annular groove 51. Thus in applying the attachment 48 to the holder I5 it is slid at its groove 56 along the boss 32 until the annular groove 51 registers with this boss whereupon the attachment may be freely rotated upon the tool holder into any desired position of angular adjustment, the interlock between the wall of the groove 51 and the boss 32 preventing accidental separation of the attachment 48 and holder in practically all positions of angular adjustment of the attachment on the holder.

Any suitable form of cutting device may be secured in the opening 59 of the attachment 48, such as for example a boring tool (not shown) for boring into the end of work held only by a chuck at its opposite end, or a cutting tool of the type used in lathes and shown at 58, the tool 58 being shown as supported in a tool holder in the form of a bar 59 secured in the opening 58 in any desired position of angular and longitudinal adjustment therein, the terminal end of the bar 59 conforming in construction to the terminal end of the bar 15 and providing stop means for cooperation with the tool 58 in the different angular positions of the latter as above described, this construction, however, not employing any boss such as shown at 32.

As will be understood from the foregoing, the provision of the attachment 48 as shown and described permits it to be angularly adjusted about the axis of the element on which it is supported to any desired position and permits of the securing of a tool in the attachment in any desired position of angular adjustment about the axis of the opening 58, thereby providing for the adjustment of the tool into any desired position for accomplishing the desired cutting of the work.

Figs. 13 and 14 illustrate two of the several ways in which the attachment 48 may be used.

In accordance with Fig. 13 both tools 29 and 58 are used simultaneously, tool 29 to effect a rough cut and tool 58 a fine out on the side of a piece of work in a lathe. In this illustration the Work is represented at 69, it being located between a rotating head 9t and a tail centering device 52, the work being rotated from the head stock in any suitable way as for example by a lathe dog (not shown) secured to the work 68 and engaging the head stock 6!.

As is common particularly in lathe constructions, the tool post 55 is mounted on the bed 63 of the lathe, through the medium of a carriage 64 adjustable lengthwise of the bed, a crosswise carriage 65 adjustable on the carriage 64 crosswise of the bed, and pivoting means (not shown) pivoting the tool post for rotatable adjustment on the carriage 65.

The tools 29 and 58 are shown as adjusted in the tool holders 1 5 and 59, respectively, to incline to the left, the bar 59 being lengthwise adjusted in the attachment 48 to such a position as will cause the tool 58 to extend nearer the longitudinal axis of the work than the tool 29 does and consequently produce a fine out following the cutting performed by the tool 29.

In the arrangement shown in Fig. 14 wherein an opening formed in the end of the work is to be reamed out, the work such as that represented at 66 is held at one end only, in a rotating chuck 61. In such an arrangement the tool 29 is inactive, the cutting being effected only by the tool supported by the attachment 48 and shown as in the form of the holder 59 with the tool 58 thereon; the adaptability of the mounting of the tool post 55 on the bed 63 to universal adjustment in a horizontal plane permitting the positioning of the tool holder 59 for presentation of the tool 58 thereon into the desired position relative to the work.

The use of the attachment 48 in connection with a tool holder such as the tool holder I5 is of especial advantage as it greatly expedites the changing of the condition of the machine for performing different kinds of work. Where the attachment 48 is to be used, and the tool 29 inactive, the latter may be retained in the tool holder i 5 without disturbing its position when in certain positions of adjustment, ready to be again used alone upon the removal of the attachment 48. Furthermore, as will be understood, where the tool 29 only is to be used, the tool holder 59 may be adjusted in the attachment 48 to a position in which the tool 58 would be inactive.

It may become desirable, while the head 48 is in position on the tool holder 5|, to adjust the position of the tool 29. To enable this to be done without removing the attachment 48 the latter is slotted as for example as illustrated at 68 and 69 to permit of access to the clamping screw 35 by any suitable form of bar wrench for manipulating it.

It will be noted that the webs having stop surfaces form abutments for limiting swinging movement of the tool whether the tool is located in a swinging member as exemplified in Figs. 5-7 or is used without such a holder member and directly engages the webs as shown in Figs. 1-4.

While I have illustrated and described certain structures constituting embodiments of my invention I do not wish to be understood as intending to limit it thereto as the same may be variously modified and altered and the invention embodied in other forms of structure without departing from the spirit of the invention.

What I claim as new, and desire to secure by Letters Patent is:

1. A tool holder comprising a member having a recess with spaced apart walls, stop-forming portions spaced from the bottom wall of said recess and extending from one to the other of said walls at opposite sides of said member, said stop-forming portions being so spaced as to permit a tool inserted into said recess and between said step portions to be swung therein crosswise of said stop portions into different angular positions and serving conjointly as abutments to limit swinging movement of the tool, and means for holding the tool in place.

2. A tool holder comprising a one-piece member for direct attachment to a tool post having a recess with spaced apart walls and stop-forming portions spaced from the bottom wall of said recess and extending from one to the other of said walls at opposite sides of said member, said stop-forming portions being so spaced as to permit a tool inserted into said recess and between said stop portions to be swung therein into different angular positions and serving conjointly as abutments to limit swinging movement of the tool, and means for holding the tool in place.

3. In combination, a tool holder comprising a member having a recess with spaced apart Walls and stop-forming portions spaced from the bottom wall of said recess and extending from one to the other of said walls at opposite side of said member, and a tool located in said recess and swingable therein into different angular positions, said stop-forming portions serving conjointly as abutments to limit swinging movement of said tool in the recess in both directions, and means for holding the tool in place.

4. A tool holder comprising a member having a recess with spaced apart walls, stop-forming portions spaced from the bottom wall of said recess and inset from the outer end of said member and extending from one to the other of said walls at opposite sides of said member, said stopforming portions being so spaced as to permit a tool inserted into said recess and between said stop portions to be swung therein into diiierent angular positions and serving conjointly as abutments to limit swinging movement of the tool, and means for holding the tool in place.

5. A tool holder comprising a member having a recess with spaced apart walls, stop-forming portions spaced from the bottom wall of said recess and extending from one to the other of said walls at opposite sides of said member, the inner wall of each of said stop-forming portions being formed of inwardly coverging surfaces, said stop-forming portions being so spaced as to permit a tool inserted into said recess and between said stop-forming portions tobe swung therein into difierent angular positions, the inwardly converging surfaces of said stop-forming portions serving conjointly as abutments to limit swinging movement of the tool, and means for holding the tool in place.

6. A tool holder comprising a member having a tool-receiving recess in an end thereof, said recess at its opposite ends being of the same width as the holder and intermediate its ends of narrower width than the holder but of suflicient width to receive a tool between them and permit swinging of the tool in said recess.

'7. A tool holder comprising a member having a recess with spaced apart walls, stop-forming portions spaced from the bottom wall of said recess and extending from one to the other of said walls at opposite sides of said member, said stop-forming portions being so spaced as to permit a tool inserted into said recess and between said stop portions to be swung therein into diiierent angular positions and serving conjointly as abutments to limit swinging movement of the tool, and means located midway between said stop-forming portions for holding the tool in place.

8. A tool holder comprising a member having a recess with spaced apart walls, stop-forming portions spaced from the bottom wall of said recess and extending from one to the other of said walls at opposite sides of said member, said stop-forming portions being so spaced as to permit a tool inserted into said recess and between said stop portions to be swung therein into difierent angular positions and serving conjointly as abutments to limit swinging movement of the tool, and means located midway between said stop-forming portions and midway of the front and rear edges of said portions for holding the tool in place.

9. A tool holder comprising a member having a recess with spaced apart walls, stop-forming portions spaced from the bottom wall of said recess and extending from one to the other of said walls at opposite sides of said member, said stop-forming portions being so spaced as to permit a tool inserted into said recess and between said stop portions to be swung therein into different angular positions and serving conjointly as abutments to limit swinging movement of the tool, a boss on the outer surface of one of said walls and means engaging said boss for holding the tool in place.

10. In combination, a tool post, structure supported on said tool post and presenting a cutting portion, and a tool fixture releasably mounted on said structure and adapted to support thereon a tool, provided as a structure separate from said cutting portion, extending generally in the same direction as, and to one side of, said structure.

11. In combination, a tool post, a tool-supporting element secured to said post, a tool on said element and swingable into difierent angular positions thereon, and a tool fixture releasably mounted on said element and adapted to support thereon a second tool extending generally in the same direction as, and to one side of, said first recited tool.

12. In combination, a tool post, a structure supported on said tool post and presenting a cutting portion and a substantially cylindrical portion, and a tool fixture releasably mounted on said cylindrical portion and adapted to support thereon a tool, provided as a structure separate from said cutting portion, extending generally in the same direction as, and to one side of, said structure.

13. A tool holder comprising a member having a recess .with spaced apart walls, stop forming portions spaced from the bottom wall of said recess and extending from one to the other of said walls at opposite sides of said member, said stop forming portions being so spaced as to permit a tool inserted into said recess and between said stop portions to be swung directly against said stop portions into difierent angular positions and serving conjointly as abutments to limit swinging movement of the tool, and means for holding the tool in place.

14. A tool holder comprising a member having a recess with spaced apart walls, stop forming portions spaced from the bottom wall of said recess and extending from one to the other of said walls at opposite sides of said member, a tool holding element located in said recess and adapted, with a tool therein, to be swung in the recess into different angular positions, said stop forming portions serving conjointly as abutments to limit swinging movement of said holder element and tool, and means for holding said tool and element in place in said recess.

15. A tool holder comprising a member having a recess with spaced apart walls, means extending from one to the other of said walls at opposite sides of said member and inset from the adjacent end of said member for preventing spreading of said walls, a tool-holding element in said recess and adjustable crosswise of said recess into different angular positions therein, and having stop surfaces with which said means cooperate to limit movement of said element, said element being located between said means, and a clamp device on one of said walls adapted to clamp a tool in said element and the combined tool and element as a unit to said member.

16. A tool holder comprising a member having a recess with spaced apart walls, means extending from one to the other of said walls at opposite sides of said member for preventing spreading of said walls, said means having stop forming portions spaced from the bottom wall of said recess, said stop forming portions being so spaced as to permit a tool inserted into said recess and between said stop portions to be swung in said recess into different angular positions and serving conjointly as abutments to limit swinging movement of the tool, and means engaging one of said walls for clamping the tool in place.

17. A tool holder comprising a member having a recess with spaced apart walls, means extending from one to the other of said walls at opposite sides of said member for preventing spreading of said walls, said means having stop forming portions spaced from the bottom wall of said recess, said stop forming portions being so spaced as to permit a tool inserted into said recess and between said stop forming portions to be swung in said recess directly against said stop portions 1 into different angular positions and serving conjointly as abutments to limit swinging movement of the tool, and means engaging one of said walls for clamping the tool in place.

18. A tool holder comprising a member having a recess with spaced apart walls, means extending from one to the other'of said walls at opposite sides of said member for preventing spreading of said walls, said means having stop forming portions spaced from the bottom wall of said recess, a tool holding element located in said recess and adapted, with a tool therein, to be swung in the recess into different angular positions, said stop forming portions serving conjointly as abutments to limit swinging movement of said holder element and tool, and means engaging one of said walls for clamping the tool in place.

19. In combination, a tool post, structure supported on said tool post and presenting a cutting portion, and a tool fixture releasably mounted on said structure and adapted to be removed from, and applied to, said structure without removing said structure from said tool post, said fixture adapted to support a tool, provided as a structure separate from said cutting portion, extending generally in the same direction as, and to one side of, said structure.

20. In combination, a tool post, an element on said post for supporting a tool, a projection on a side of said element, means in said projection for holding a tool in position on said element, and a tool fixture formed of a head having a bore the wall of which is grooved lengthwise of the bore to receive said projection and circumferentially grooved to receive said projection, said fixture being adapted to support thereon a second tool extending generally in the direction as, and to one side of, said bore.

21. In combination, a tool post, an element on said tool post having a tool receiving recess, stop portions extending from one to the other of the walls of said recess preventing them from spreading and also from moving toward each other, and a tool fixture having a portion surrounding the recessed portion of said element and adapted to support thereon a tool extending generally in the same direction as, and to one side of, said element, said stop portions preventing deflection of said walls in the tightening of said fixture on said element.

' JOHN T. HISCOCK. 

